CV

Education

• PhD in Economic History, LSE, in progress
• MPhil in Sociology and Demography, University of Oxford, 2023
• BA in Human Sciences, University of Oxford, 2021

Academic positions

• Oslo Metropolitan University
  • Research Fellow (Forsker III), Centre for Pandemics & Society (PANSOC), January–December 2024

Academic affiliations

• Leverhulme Centre for Demographic Science, University of Oxford, July 2025–
• Centre for Advanced Study at the Norwegian Academy of Science and Letters, Short-term Residential Fellow, November–December 2025

Teaching positions

• University of Oxford
  • Instructor for “Demography and Population” (BA Human Sciences & BA Philosophy, Politics, and Economics), 2022–
  • Instructor for “Introduction to Demography” (BA Human Sciences), 2023

Publications

1. Gaddy, H., Sear, R., & Fortunato, L. (2025). High rates of polygyny do not lock large proportions of men out of the marriage market. PNAS, 122(40): e2508091122. doi:10.1073/pnas.2508091122
2. Blinkova, A.O., Khakurel, U., Gaddy, H., Mamelund, S.-E., & Bekker-Nielsen Dunbar, M. (2025). Construction and curation of a data set of historical mental health incidence in Norway. Scientific Data 12: 1510. doi:10.1038/s41597-025-05795-y
3. Gaddy, H., & Gargiulo, M. (2025). Can we estimate crisis death tolls by subtracting total population estimates? A critical review and appraisal. Demographic Research, 52: 741–796. doi:10.4054/DemRes.2025.52.23
4. Gaddy, H., & Mølbak Ingholt, M. (2024). Did the 1918 pandemic cause a 1920 baby boom? Demographic evidence from neutral Europe. Population Studies, 78: 269–287. doi:10.1080/00324728.2023.2192041
5. Gaddy, H. (2021). Social distancing and influenza mortality in 1918 did not increase suicide rates in the United States. SSM – Population Health, 6: 100944. doi:10.1016/j.ssmph.2021.100944
6. Gaddy, H. (2021). A decade of TFR declines suggests no relationship between development and sub-replacement fertility rebounds. Demographic Research 44: 125–142. doi:10.4054/DemRes.2021.44.5
7. Gaddy, H. (2020). Brexit and the geography of depression. Social Science & Medicine 264: 113276. doi:10.1016/j.socscimed.2020.113276
8. Gaddy, H. (2020). Using local knowledge in emerging infectious disease research. Social Science & Medicine 258: 113107. doi:10.1016/j.socscimed.2020.113107

Awards and grants

• LSE PhD Studentship, London School of Economics, 2023–28
• Roger Schofield Award for Best Paper by a Young Demographer, European Society of Historical Demography, 2022
• Grand Union Doctoral Training Partnership Scholarship, Economic and Social Research Council (ESRC) and Nuffield College, Oxford, 2021–23
• Wilma Crowther Prize for Best Undergraduate Dissertation, Institute of Human Sciences, Oxford, 2021
• Demyship (highest undergraduate prize), Magdalen College, Oxford, 2020

Other employment

• Calleva Research Centre for Evolution and Human Science, University of Oxford
  • Administrative assistant, 2023–
• Magdalen College, University of Oxford
  • BA Human Sciences admissions interviewer, 2023
• Centre for Experimental Social Sciences, University of Oxford
  • Laboratory assistant, 2022–23

Service

• Current positions
  • LSE Historical Economic Demography Group, Advisory Board Member, 2025–
  • Association of Young Historical Demographers, Board member, 2024–
  • GreatLeap, COST Management Committee member, 2023–
• Conference organisation
  • European Society of Historical Demography (ESHD), Session chair (2025)
  • European Social Science History Conference (ESSHC), Session organiser and discussant (2025)
  • PopFest, Historical Demography strand co-organiser (2025)
  • British Society of Population Studies (BSPS), Session chair (2024; 2022 x 2)
• Peer review
  • Demography (2), International Journal of Epidemiology (1), Population Studies (1), Schizophrenia (1), Violence Against Women (1), Humanities & Social Sciences Communications (1), Journal of Comparative Family Studies (1), Human Ecology (1), EcoHealth (1), Ethnobiology and Conservation (1), Czech Science Foundation (1)